Valve-motion for percussive tools.



L. 0'. BAYLES. VALVE MOTION FOR rzacuss vn TOOLS.

; KPPLIGATION FILED SEPT. 18, 1911.

1,Q57,700. Patented Apr. 1,1913.

- a new and useful Improvement in Valvea valve may be employed which is very tnarrm) s-T rns PATENT @FFICE.

LEWIS o. BAYLES, or EASTON, PENNSYLVANIA, Assrenon T mGnRsoLL-n-Ann COMPANY, or new YORK, n. Y., AconronA'rIoN or new JERSEY.

VALVE-MOTION FOR PERCUSSIVE TOOLS.

a citizen of the United States, and resident of Easton, in the county of Northampton and State of Pennsylvania, have invented Motions for Percussive Tools, of which the following is a specification. y

This invention relates to a valve motion for motive fluid operated percussive tools, and has for its object to provide certain improvements in the construction, form and operation of the valve mechanism whereby simple in construction, rapid in operation and positive in action.

Thls invention 1s more particularly d1- rected to a reciprocating valve having a,

head and stem, the head being arranged to control the inlet ports for both ends of the cylinder and the stem being arranged to control the exhaust port for one end of the cylinder, as for instance, the front end thereof.

A practical embodiment of the invention is representedin the accompanying drawings 111 which,

Figure 1 is a diagrammatic section through a motive fluid operated percussive tool of the pistonhammer type, the parts being in the positions which they assume when the inlet port for the back end of the cylinder is opened to the motive fluid supply, the inlet port for the front end of the cylinder being closed and-the exhaust port for the front end of the cylinder being opened to external atmosphere. Fig. 2is a, similar view with the parts in the POSltlOIlS which they assume when the inlet port for the front end of the cylinder is opened to the motive fluid supply, the inlet port for the back end of the cylinder being closedv and the exhaust port for'the front end of the cylinder being closed. 1 i In the accompanying drawings the percussive tool is shown as a riveting hammer, the cylinder being denoted by, 1, theplston hammer by 2 and the riveting set which projects into the front end of the piston chamber, by 3. The valve which controls the operation of the tool has a head i fitted to slide in the chamber 6 of the valve chest and a stem 5 fitted to slide in the chamber 7 of the valve chest. A motive fluid supply passage 8 is provided with restricted branch Specification of Letters Patent.

Patented Apr. 1, 191.3.

Application filed September 18, 1911. 1, Serial No. 649,947.

passages 9, 10, leading to the opposite ends of the chamber 6. The back and front inlet ports 11, 12, for the cylinder open into the back and front ends of the chamber 6, opposite the back and front faces of the valve head 4, so that the said ports are opened and closed by a movementof the valve head in a line perpendicular to the surface through which said ports open. The front exhaust port 13 for the-cylinder 1, opens into the chamber 7 of the valve chest in position to be opened and closed by the valve stem 5. A continuation 14 oft-he front exhaust port 13 leads to external atmosphere and the stem 5 is provided with a port 15 which is arrangedto open and close the exhaust port as the valve reciprocates. The rear exhaust port 16 for the cylinder 1, opens directly to external atmosphere and in the present instance'isso arranged that it will be alternately opened to the opposite sides of the piston hammer 2, as the hammer reciprocates. The opposite ends of the head 4 of the controlling valve are preferablytapered as shown at 1.7, 18, for facilitating the rapid operation of the valve. The mouth of the back inlet port 11 at the valve chest is preferably enlarged as shown at 19, and the mouth of the front inlet port 12 is also preferably enlarged at the valve chest as shown at 20. A vent 21 leading to the front inletport 12, is provided for the chamber 7 of the valve chest.

It will be seen from the above description that the reciprocation of the valve will alternately open the mouth of the fluid supply passage 8, through its branches9, 10, to the back and front inlet ports 11 and 12,

'and will alternatelyopen and close the front back exhaust ports may be located at any desired position in the cylinder so as to secure the desired operation of the tool by throwing the controlling valve at an earlier or later moment. 1 f p v While I have shown this var/e mechanism in connection with a riveting tool, it is to be understood that I do not wish to limit myself to this use, but contemplate the use of the valve mechanism wherever ap plicable in percussive machines and tools.

Whatl 'claii'nis: v 1. A cyl nder, its piston and a valve-having a head arranged 'to control the admisa valve therein having a head and stem,

close-an exhaust portfor the front end of the cylinder;

3. A cylinder having separate inlet and exhanst'ports, itspiston, and a'valve. having a head for controlling the inlet ports, andta stein for controlling a front exhaust por ex ust ports, its. piston and a valve having ahead .fonopeining' and closingthe inlet ports by "a movement directly toward and away fromithemouths of'said ports, and a stern for opening' and closing a front ex-. haust the mouth of said port.

. 5. A cylinderhaving inlet ports for both of its ends and intermediate exhaust ports, its piston and a-valve for controlling .the inlet ports and one exhaust portonly.

' 6; A-cyli'nder having inlet ports for both of its ends and intermediate exhaust ports,

its piston,.and avalve arranged to control the inletports and one of the exhaust ports,

the other exhaust port opening directly to.

external. atmosphere.

' 7; A cylinder havinginlet ports for both of its ends and intermediate exhaust ports,-

its'piston, and a valve having a head for opening and. closing the inlet ports and a stem for opening and closing the front exhaust port. 7

8. A cylinder having inlet ports for both of its ends and intermediate exhaust ports,

itspiston, and a valve having a head for opening and closing the inlet ports and a stem for-opening and closing one of the exhaust ports the other exhaust port being open directlyfto"external atmosphere.

9. A cylinder, its piston, a valve chest,

front and rear inlet ports for the cylinder leading into .the valve chest opposite the faces of the valve head, whereby/(he move:

ment of the valve alternately opens and.

closes the inlet,- ports, and a front exhaust port for the cylinder leading to .the valve,

chest into position to be opened and closed by the valve stem. a

10. A cylinder, its piston, a valve chest,

-ment of the valve aiternateiy opens A cylinder having separate inlet and port by. a slidingjmovement across a valve therein having a head and stem, front and rear inletports-ftor cylinder leading into the valve chest opposite the" faces oft-he valve head, 'vvherehy the move and closes the inlet ports and a tram enhanst port for the cylinder lead t t 31 valve chest into posit-inn to he o at closed bythe valvesteni and are-av ezvnaust port leading directly to external atniospher L- 11. A cylinder, its piston, a valve chest,

a valve therein having head and stern, front and rear inlet portsftor the cylinderleadinginto the valve chest opposite the faces of the valve head, wherehy the movement of the valve alternately opens and closes the inlet parts, and front enhatlst port for the cylinder leading to valve chest into position to be opened and closed by the valve stem and arear exhaust port leading directly to external atmosphere, said rear exhaust poi-theing located in position to he alternately opened to the front and'b'ack sides of the said piston.

12. A cylinder, its piston, a valve chest, a valve therein, front hack inlet ports v for the cylinder opening into the valve chest opposite the front and faces of the valve, a -mo-t1ve thud 'sapplypassage having branches leading ther from to the opposite ends of the valve chest and intermediate exhaust ports for said cylinder.

13. A cylinder. its piston, 11 valve chest, a valve therein, front and. back inlet ports for the. cylinder opening into the valve I chest opposite the front and back faces of the valve, a motive timid supply passage having branches leading therefrom to the opposite ends of the valve chest and intermediate exhaust ports for said-cylinder. the exhaust port from the forward end being controlled by the valve,

'14:. A cylinder, its piston a valve chest, a valve having a head and. a Gill front and back inlet ports for the cylinder'opening into the valve chest opposite the front and back faces of" the valve head, a motive fluid supply passage having branches leading therefrom to the opposite ends of the valve chest and intermediate exhaust ports for said cylinder, the exhaust port for the ion- Ward end being controlled hy the alve stem. In testimony, thati claim the foregoing asmy invention, l have ,,ii.ed my name in presence of two WltHCSSQa, this lifth day of September 1911. 

